Hi all,

I added a disk (/dev/sdc) to my CentOS 6 VM. I have a physical volume group called "vg_oracle" and a logical volume that was 5GB in size called "vg_oraflash". I used fdisk to format /dev/sdc, which created /dev/sdc1. I then used this command to add the volume /dev/sdc1 to "vg_oracle":

vgextend vg_oracle /dev/sdc1

I then used this command to extend LV "vg_oraflash" by 10GB:

lvextend -L10G /dev/vg_oracle/vg_oraflash

I ran "mount -a" because I didn't see the additional space reflected, but no change. I then rebooted, but still no change. What am I missing? Any help would be greatly appreciated.

Thanks,
Dave

You need to run pvcreate on /dev/sdc1 before the vgextend.

Actually, you don't. Quote from the vgextend manpage:

"If PhysicalDevicePath was not previously configured for LVM with pvcreate (8), the device will be initialized with the same default values used with pvcreate."

To the OP: You just need to expand the filesystem to fill its new container. If this was an ext2/3/4 filesystem, the command would beIt is safe to run that while the filesystem is mounted -- resize2fs will let you know if it can't do it that way.

1 members found this post helpful.

Hopefully that only applies to --restoremissing - else any partition (i.e. filesystem) could be erased silently.

Your hopes are hereby crushed. It will happily overwrite any filesystem that is not currently mounted, as would pvcreate (or, for that matter, mkfs, or any of a host of other commands, many of which would not bother to check whether that filesystem might be mounted).

Worked like a champ - thanks!!!

[root@oem ~]# resize2fs /dev/vg_oracle/vg_oraflash
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_oracle/vg_oraflash is mounted on /oraflash; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/vg_oracle/vg_oraflash to 2621440 (4k) blocks.
The filesystem on /dev/vg_oracle/vg_oraflash is now 2621440 blocks long.

[root@oem ~]# df -h
Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg_oracle-vg_oraflash
9.9G 4.7G 4.7G 50% /oraflash

I noted the error in my syntax. "lvextend -L10G" extends the volume to a total size of 10GB, NOT by a further 10GB. Nonetheless, thank you all so much for your input. Case closed